[v3,3/8] ceph: add global read latency metric support

Message ID	20200115034444.14304-4-xiubli@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=rcmg=3E=vger.kernel.org=ceph-devel-owner@kernel.org> From: xiubli@redhat.com To: jlayton@kernel.org, idryomov@gmail.com, zyan@redhat.com Cc: sage@redhat.com, pdonnell@redhat.com, ceph-devel@vger.kernel.org, Xiubo Li <xiubli@redhat.com> Subject: [PATCH v3 3/8] ceph: add global read latency metric support Date: Tue, 14 Jan 2020 22:44:39 -0500 Message-Id: <20200115034444.14304-4-xiubli@redhat.com> In-Reply-To: <20200115034444.14304-1-xiubli@redhat.com> References: <20200115034444.14304-1-xiubli@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk
Series	ceph: add perf metrics support \| expand [v3,0/8] ceph: add perf metrics support [v3,1/8] ceph: add global dentry lease metric support [v3,2/8] ceph: add caps perf metric for each session [v3,3/8] ceph: add global read latency metric support [v3,4/8] ceph: add global write latency metric support [v3,5/8] ceph: add global metadata perf metric support [v3,6/8] ceph: periodically send perf metrics to MDS [v3,7/8] ceph: add reset metrics support [v3,8/8] ceph: send client provided metric flags in client metadata

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index fe8adf3dc065..2a32f731f92a 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -190,6 +190,8 @@ static int ceph_do_readpage(struct file *filp, struct page *page) struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; + s64 latency; int err = 0; u64 off = page_offset(page); u64 len = PAGE_SIZE; @@ -221,7 +223,7 @@ static int ceph_do_readpage(struct file *filp, struct page *page) err = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), &ci->i_layout, off, &len, ci->i_truncate_seq, ci->i_truncate_size, - &page, 1, 0); + &page, 1, 0, &latency); if (err == -ENOENT) err = 0; if (err < 0) { @@ -241,6 +243,9 @@ static int ceph_do_readpage(struct file *filp, struct page *page) ceph_readpage_to_fscache(inode, page); out: + if (latency) + ceph_mdsc_update_read_latency(metric, latency); + return err < 0 ? err : 0; } @@ -260,6 +265,8 @@ static int ceph_readpage(struct file *filp, struct page *page) static void finish_read(struct ceph_osd_request *req) { struct inode *inode = req->r_inode; + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_osd_data *osd_data; int rc = req->r_result <= 0 ? req->r_result : 0; int bytes = req->r_result >= 0 ? req->r_result : 0; @@ -297,6 +304,12 @@ static void finish_read(struct ceph_osd_request *req) put_page(page); bytes -= PAGE_SIZE; } + + if (rc >= 0 || rc == -ENOENT) { + s64 latency = jiffies - req->r_start_stamp; + ceph_mdsc_update_read_latency(metric, latency); + } + kfree(osd_data->pages); } diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index c132fdb40d53..8200bf025ccd 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -128,8 +128,21 @@ static int metric_show(struct seq_file *s, void *p) { struct ceph_fs_client *fsc = s->private; struct ceph_mds_client *mdsc = fsc->mdsc; + s64 total, sum, avg = 0; int i; + seq_printf(s, "item total sum_lat(us) avg_lat(us)\n"); + seq_printf(s, "-----------------------------------------------------\n"); + + spin_lock(&mdsc->metric.read_lock); + total = atomic64_read(&mdsc->metric.total_reads), + sum = timespec64_to_ns(&mdsc->metric.read_latency_sum); + spin_unlock(&mdsc->metric.read_lock); + avg = total ? sum / total : 0; + seq_printf(s, "%-14s%-12lld%-16lld%lld\n", "read", + total, sum / NSEC_PER_USEC, avg / NSEC_PER_USEC); + + seq_printf(s, "\n"); seq_printf(s, "item total miss hit\n"); seq_printf(s, "-------------------------------------------------\n"); diff --git a/fs/ceph/file.c b/fs/ceph/file.c index b32aba4023b3..797d4d224223 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -587,6 +587,7 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_osd_client *osdc = &fsc->client->osdc; ssize_t ret; u64 off = iocb->ki_pos; @@ -659,6 +660,11 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, ret = ceph_osdc_start_request(osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(osdc, req); + + if (ret >= 0 || ret == -ENOENT || ret == -ETIMEDOUT) { + s64 latency = jiffies - req->r_start_stamp; + ceph_mdsc_update_read_latency(metric, latency); + } ceph_osdc_put_request(req); i_size = i_size_read(inode); @@ -797,6 +803,8 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req) struct inode *inode = req->r_inode; struct ceph_aio_request *aio_req = req->r_priv; struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); BUG_ON(!osd_data->num_bvecs); @@ -804,6 +812,19 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req) dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, osd_data->bvec_pos.iter.bi_size); + /* r_start_stamp == 0 means the request was not submitted */ + if (req->r_start_stamp && (rc >= 0 || rc == -ENOENT)) { + s64 latency = jiffies - req->r_start_stamp; + struct ceph_osd_req_op *op; + int i; + + for (i = 0; i < req->r_num_ops; i++) { + op = &req->r_ops[i]; + if (op->op == CEPH_OSD_OP_READ) + ceph_mdsc_update_read_latency(metric, latency); + } + } + if (rc == -EOLDSNAPC) { struct ceph_aio_work *aio_work; BUG_ON(!aio_req->write); @@ -932,6 +953,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_vino vino; struct ceph_osd_request *req; struct bio_vec *bvecs; @@ -1048,6 +1070,13 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, if (!ret) ret = ceph_osdc_wait_request(&fsc->client->osdc, req); + if ((ret >= 0 || ret == -ENOENT || ret == -ETIMEDOUT)) { + s64 latency = jiffies - req->r_start_stamp; + + if (!write) + ceph_mdsc_update_read_latency(metric, latency); + } + size = i_size_read(inode); if (!write) { if (ret == -ENOENT) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 141c1c03636c..dc2cda55a5a5 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -4093,6 +4093,25 @@ static void maybe_recover_session(struct ceph_mds_client *mdsc) ceph_force_reconnect(fsc->sb); } +/* + * metric helpers + */ +void ceph_mdsc_update_read_latency(struct ceph_client_metric *m, + s64 latency) +{ + struct timespec64 ts; + + if (!m) + return; + + jiffies_to_timespec64(latency, &ts); + + spin_lock(&m->read_lock); + atomic64_inc(&m->total_reads); + m->read_latency_sum = timespec64_add(m->read_latency_sum, ts); + spin_unlock(&m->read_lock); +} + /* * delayed work -- periodically trim expired leases, renew caps with mds */ @@ -4182,13 +4201,17 @@ static int ceph_mdsc_metric_init(struct ceph_client_metric *metric) atomic64_set(&metric->total_dentries, 0); ret = percpu_counter_init(&metric->d_lease_hit, 0, GFP_KERNEL); if (ret) - return ret; + return ret;; ret = percpu_counter_init(&metric->d_lease_mis, 0, GFP_KERNEL); if (ret) { percpu_counter_destroy(&metric->d_lease_hit); return ret; } + spin_lock_init(&metric->read_lock); + memset(&metric->read_latency_sum, 0, sizeof(struct timespec64)); + atomic64_set(&metric->total_reads, 0); + return 0; } diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 7645cecf7fb0..fee25b999c7c 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -366,6 +366,10 @@ struct ceph_client_metric { atomic64_t total_dentries; struct percpu_counter d_lease_hit; struct percpu_counter d_lease_mis; + + spinlock_t read_lock; + atomic64_t total_reads; + struct timespec64 read_latency_sum; }; /* @@ -549,4 +553,7 @@ extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, extern int ceph_trim_caps(struct ceph_mds_client *mdsc, struct ceph_mds_session *session, int max_caps); + +extern void ceph_mdsc_update_read_latency(struct ceph_client_metric *m, + s64 latency); #endif diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h index 5a62dbd3f4c2..43e4240d88e7 100644 --- a/include/linux/ceph/osd_client.h +++ b/include/linux/ceph/osd_client.h @@ -515,7 +515,7 @@ extern int ceph_osdc_readpages(struct ceph_osd_client *osdc, u64 off, u64 *plen, u32 truncate_seq, u64 truncate_size, struct page **pages, int nr_pages, - int page_align); + int page_align, s64 *latency); extern int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino, diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index b68b376d8c2f..62eb758f2474 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -5238,11 +5238,15 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc, struct ceph_vino vino, struct ceph_file_layout *layout, u64 off, u64 *plen, u32 truncate_seq, u64 truncate_size, - struct page **pages, int num_pages, int page_align) + struct page **pages, int num_pages, int page_align, + s64 *latency) { struct ceph_osd_request *req; int rc = 0; + if (latency) + *latency = 0; + dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino, vino.snap, off, *plen); req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1, @@ -5263,6 +5267,9 @@ int ceph_osdc_readpages(struct ceph_osd_client *osdc, if (!rc) rc = ceph_osdc_wait_request(osdc, req); + if (latency && (rc >= 0 || rc == -ENOENT || rc == -ETIMEDOUT)) + *latency = jiffies - req->r_start_stamp; + ceph_osdc_put_request(req); dout("readpages result %d\n", rc); return rc;

[v3,3/8] ceph: add global read latency metric support

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Patch